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(a) Hematoxylin and Eosin (H&E), 4× magnification; (b) H&E, 20× magnification; (c) Bcl-2 immunostaining, DAB chromogen, 20× magnification; (d) CD 34 immunostaining, DAB chromogen, 20× magnification; (e) CD 99 immunostaining, DAB chromogen, 20× magnification; (f) Vimentin immunostaining, DAB chromogen, 20× magnification
